CN101290090B - Light source scattering illumination device of detection system - Google Patents

Abstract

The invention is a light source scattering illumination device of detection system, comprising: a reflection cover body, a Teflon scattering layer and at least one light-emitting device. The reflector body is provided with a slotted hole. The Teflon (PTFE) scattering layer is arranged on the inner wall of the reflector body. The at least one light-emitting device is arranged in the reflector body and is also provided with a plurality of light-emitting bodies which are arranged in an array form to provide light sources. The Teflon scattering layer can provide excellent scattering efficiency so as to generate uniform scattered light. The light emitting device selects a high-power light emitting diode as a light emitting source and can also provide better light intensity, so that the light source scattering device can generate high-brightness and uniform scattered light to solve the problem of insufficient illumination intensity of the detection system.

Description

Light source scattering lighting device for detection system

technical field

The present invention relates to a diffused lighting device, in particular to a light source scattering detection system which uses Teflon material as a diffuser film and uses an array of light sources to increase the amount of light source to achieve uniform scattered light and improve illumination intensity. lighting fixtures.

Background technique

Inspection procedures play a very important role in the manufacturing process of products. Use the detection device to capture the image of the object to be tested, and use automatic or manual judgment to identify the product, such as: panel, printed circuit board or chip defects, such as: impurities, short circuit or open circuit, scratches, etc. Defects, in order to do a good job in quality control.

Please refer to FIG. 1 , which is a schematic diagram of a diffuse lighting device disclosed in the prior art. The device 1 has a base 10 , a reflective cover 12 , a light emitting device 13 and a one-sided image capturing device 14 . The base 10 carries a test object 15 . The reflective cover 12 is disposed on the base 10 and covers the object under test 15 , and a slot 16 is defined above the reflective cover 12 . The illuminating device 13 is arranged on the inner wall edge of the reflective cover 12 . The light emitted by the illuminating device 13 is diffused onto the object under test 15 through the reflective cover 12 , so that the surface image capturing device 14 passes through the slot 16 An image of the object under test 15 is captured for detection.

Another example is US Pat. No. 6,341,878 which also discloses a technique similar to the above, in which the light source device is arranged under the object under test in the form of a planar backlight source. The disadvantages of the above-mentioned technology types are that they are only suitable for small-area detection, and cannot capture the image of the object under test at high speed. In addition, the light-scattering materials coated in the reflectors of the aforementioned technologies, such as SPECTRALON or SPECTRAFLECT, are mostly expensive and toxic materials. In order to reduce costs, some manufacturers replace it with white paint, which reduces the intensity of scattered light projected to the object under test.

Due to the disadvantage of speed in area scanning, a line-scan photocoupler (Charged-coupled device, CCD, hereinafter referred to as line-scan CCD) was developed to perform fast scanning. Because the line scan CCD has the characteristics of fast measurement speed, it is especially suitable for fast defect image detection. However, because the line-scan CCD scans an image by multiple scanning lines to form a scanning surface, the exposure time of the CCD between lines and lines becomes shorter during high-speed scanning, thereby producing a line-scan CCD. Into the problem of insufficient light.

In order to solve this problem, a powerful light projection system and cheap materials with good scattering effect are needed, so that the line scan CCD can obtain enough brightness to capture images. Therefore, there is an urgent need for a light source scattering lighting device for a detection system to solve the problems in the prior art.

Contents of the invention

The main purpose of the present invention is to provide a light source scattering lighting device for a detection system, which uses Teflon material as a scattering film to achieve the purpose of improving the scattering efficiency, uniform light and reducing costs.

A secondary object of the present invention is to provide a light source scattering lighting device for a detection system, which is a high-power LED array to provide lighting to achieve the purpose of increasing light intensity.

Another object of the present invention is to provide a light source scattering lighting device for a detection system, which is provided with a heat dissipation mechanism on the light source to avoid excessive temperature of the light source and prolong the life of the light source.

In order to achieve the above object, the present invention provides a light source scattering device for a detection system, which includes: a reflective cover with a slot; a Teflon (PTFE) scattering layer arranged on the on the inner wall of the reflective cover; and at least one light-emitting device, which is arranged in the reflective cover, and the light-emitting device also has a plurality of luminous bodies, and the plurality of luminous bodies are arranged in an array to provide a light source.

Preferably, the reflective cover is a circular cover. The light-emitting device is an annular array of light-emitting devices, which are arranged around the inner wall of the opening of the circular cover.

Preferably, the reflective cover is an oval cover. Wherein the light-emitting device is an annular array of light-emitting devices, which are arranged around the inner wall of the opening of the oval cover.

Preferably, the reflective cover is a semi-cylindrical cover. The light-emitting device is a linear array of light-emitting devices, which are arranged on the edge of the inner wall of the opening of the semi-cylindrical cover.

Preferably, the illuminant is a light emitting diode. The power range of the light-emitting diodes described therein is 3W-7W.

Preferably, the light-emitting device further includes: a substrate, which is coupled to the plurality of luminous bodies; and a heat dissipation plate, which is connected to the substrate to absorb the The heat generated by the plurality of luminous bodies. A plurality of through holes are also opened on the base plate to transmit heat to the heat dissipation plate. The through hole is also filled with an insulating and heat-conducting material. In addition, the heat dissipation plate also has a plurality of heat dissipation fins.

Preferably, the light-emitting device further includes: a substrate, which is coupled to the plurality of luminous bodies; an insulating and heat-conducting layer, which is arranged on one side of the substrate; and a The heat dissipation plate is connected with the insulating and heat-conducting layer to absorb the heat generated by the plurality of luminous bodies. A plurality of through holes are also opened on the substrate to transfer heat to the heat dissipation plate. Moreover, the through hole is also filled with an insulating and heat-conducting material. In addition, the heat dissipation plate also has a plurality of heat dissipation fins.

Description of drawings

Fig. 1 is a schematic diagram of a diffuse lighting device disclosed in the prior art;

2A and 2B are schematic diagrams of a preferred embodiment of the light source scattering lighting device of the detection system of the present invention;

Figure 3 shows the reflectance of different scattering materials in the wavelength range of 400nm to 700nm;

4A is a schematic diagram of a first preferred embodiment of the light source device of the present invention;

4B is a schematic diagram of a second preferred embodiment of the light source device of the present invention;

Fig. 5 is a schematic diagram of another preferred embodiment of the light source scattering illumination device of the detection system of the present invention.

Explanation of reference signs: 1-scattering lighting device; 10-base; 12-reflecting cover; 13-light emitting device; 14-surface image capture device; 15-object under test; 16-slot hole; Scattering lighting device; 20-cover body; 201-slot hole; 21-Teflon scattering layer; 22-light-emitting device; 220-luminous body; 2200-light-emitting diode; 2204-base; 221-substrate; 2210-through hole; 222-insulation and heat conduction layer; 223-heat dissipation plate; 2230-radiation fin; 23-image capture device; - linear slots; 31 - Teflon scattering layer; 32 - light emitting device; 33 - image capture device.

Detailed ways

The above and other technical features and advantages of the present invention will be described in more detail below in conjunction with the accompanying drawings.

Please refer to FIG. 2A and FIG. 2B , which are schematic diagrams of a preferred embodiment of the light source scattering illumination device of the detection system of the present invention. In FIG. 2A , the light source scattering lighting device 2 has a reflective cover 20 , a Teflon (Poly tetrafluoroethylene, PTEF) scattering layer 21 and at least one light emitting device 22 . In this embodiment, the reflective cover 20 is a semi-cylindrical cover, and a slot 201 is defined above the cover 20, and the slot 201 is a linear slot. An image capture device 23 is disposed above the slot 201 , and the image capture device 23 in this embodiment is a line-scan photocoupler device (line-scan CCD).

As shown in Figure 2B, on the inner wall surface of the reflective cover 20, the Teflon scattering layer 21 is attached, and the Teflon scattering layer 21 can provide better reflectivity, so that The light emitted by the light-emitting device 22 passes through the Teflon scattering layer 21 and can generate uniform light distribution to project an object under test (not shown in the figure). Please refer to FIG. 3 , which is an illustration of a comparison table of reflectivity of different scattering materials in the wavelength range of 400nm-700nm. It can be seen from the figure that, with a thickness of 2.2 mm and a test light wavelength range of 400 nm to 700 nm, Teflon material does have better reflectivity than SPETROLON and SPECTRAFLECT materials. In addition, Teflon is also cheaper and environmentally friendly than materials such as SPETROLON and SPECTRAFLECT.

The at least one light-emitting device 22 is arranged in the reflective cover 20, and the light-emitting device 22 also has a plurality of illuminants, and the plurality of illuminants are arranged in arrays to provide light sources . In this embodiment, there are a pair of light emitting devices 22, which are respectively arranged on the two side edges of the inner wall of the semi-cylindrical reflective cover 20 to provide light required for lighting. Please refer to FIG. 4A , which is a schematic diagram of a first preferred embodiment of the light source device of the present invention. The light-emitting device 22 has a substrate 221 , an insulating and heat-conducting layer 222 and a heat dissipation plate 223 . The substrate 221 is electrically connected to the plurality of illuminants 220 . The illuminant 220 has a light emitting diode 2200, which is set on a base 2204, and the base 2204 is made of metal to increase the cooling effect. Both sides of the base 2204 have a positive electrode 2202 and a negative electrode 2203, which are respectively electrically connected to the solder joints 2201 on the substrate 2200 by means of solder. In this embodiment, the anode 2202 is connected to the base 2204 . The light-emitting diode 2200 is a high-power light-emitting diode, and its power is between 3W-7W, but not limited thereto.

Since the use of high-power light-emitting diodes can produce high-brightness effects, it is also prone to high temperature problems. Therefore, the light-emitting device of the present invention has a heat dissipation design to reduce the temperature of the luminous body 220, thereby prolonging the life of the luminous body 220. The bottom surface of the substrate 221 is connected to the insulating and heat-conducting layer 222 . The insulating and heat-conducting layer 222 can be formed by heat-conducting paste or heat-conducting adhesive; in addition, the insulating and heat-conducting layer 222 can also be attached to the substrate 221 through the adhesive. In order to increase the effect of heat conduction, a plurality of through holes 2210 may also be opened on the substrate 221 . The through hole 2210 may be filled with air or heat conducting material, so as to transfer the heat generated by the light emitting diode to the insulating heat conducting layer 222 and then to the heat dissipation plate 223 . The heat dissipation plate 223 is connected to the insulating heat conduction layer 222 through the insulating adhesive, and the heat dissipation plate 223 may also have heat dissipation fins 2230 to increase the effect of heat dissipation. Please refer to FIG. 4B , which is a schematic diagram of a second preferred embodiment of the light source device of the present invention. In this embodiment, the heat dissipation plate 223 can also be connected to the substrate 221 through an insulating back glue, so as to achieve the effect of heat dissipation.

Please refer to FIG. 5 , which is a schematic diagram of another preferred embodiment of the light source scattering lighting device of the detection system of the present invention. In this embodiment, the reflective cover 30 of the diffuse lighting device 3 is a semi-spherical cover, but it is not limited thereto, for example, it may also be a semi-elliptical spherical cover. A linear slot 301 is also opened on the top of the reflective cover 30, and a light emitting device 32 is arranged around the inner wall of the cover 30, and the light emitting device 32 has a plurality of luminous bodies arranged in a ring. The detailed structure of the light emitting device 32 is as described above, and will not be repeated here. There is an image capture device 33 above the linear slot 301, and the image capture device 33 is a line-scanning CCD in this embodiment.

To sum up the above, the light source scattering lighting device of the detection system provided by the present invention has the advantages of reducing cost and improving light intensity and uniform astigmatism, and can be applied in different occasions, so it can meet the needs of the industry and further improve the competitiveness of the industry In order to promote the development of surrounding industries, and sincerity has met the requirements required for an invention application as stipulated in the Invention Patent Law, the application for an invention patent is submitted according to law.

The above descriptions are only preferred embodiments of the present invention, and are only illustrative rather than restrictive to the present invention. Those skilled in the art understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.

Claims (11)

1. A light source scattering device of a detection system, characterized in that: it comprises: A reflective cover, which is provided with a linear slot; A Teflon scattering layer, which is arranged on the inner wall of the reflective cover; and At least one light-emitting device, which is arranged in the reflective cover, and the light-emitting device also has a plurality of illuminants, and the plurality of illuminants are arranged in an array to provide a light source; The reflective cover is a semi-cylindrical cover, and the at least one light-emitting device is arranged on the edge of the inner wall of the opening of the semi-cylindrical cover. 2. The light source scattering device of the detection system according to claim 1, wherein the illuminant is a light emitting diode. 3. The light source scattering device of the detection system according to claim 2, characterized in that: the power range of the light emitting diode is 3W-7W. 4. The light source scattering device of the detection system according to claim 1, wherein the light emitting device further comprises: a substrate, which is coupled to the plurality of light emitters; and A heat dissipation plate is connected with the base plate to absorb the heat generated by the plurality of luminous bodies. 5 . The light source scattering device of the detection system according to claim 4 , wherein a plurality of through holes are opened on the substrate to transfer heat to the heat sink. 6 . 6 . The light source scattering device of the detection system according to claim 5 , wherein the through hole is also filled with an insulating and heat-conducting material. 7 . 7. The light source scattering device of the detection system according to claim 4, characterized in that: the heat dissipation plate further has a plurality of heat dissipation fins. 8. The light source scattering device of the detection system according to claim 1, wherein the light emitting device further comprises: a substrate, which is coupled to the plurality of light emitters; an insulating and heat-conducting layer, which is arranged on one side of the substrate; and A heat dissipation plate is connected with the insulating and heat-conducting layer to absorb the heat generated by the plurality of luminous bodies. 9 . The light source scattering device of the detection system according to claim 8 , wherein a plurality of through holes are opened on the substrate to transfer heat to the heat sink. 10 . 10 . The light source scattering device of the detection system according to claim 9 , wherein the through hole is also filled with an insulating and heat-conducting material. 11 . 11. The light source scattering device of the detection system according to claim 8, characterized in that: the heat dissipation plate further has a plurality of heat dissipation fins.

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